Hi, I have a problem in communicating a waveform with the following specs: Waveform Baud rate = 2400 Waveform Sample rate = 9600 Hz USRP input sample rate = 400 kHz (9600 Hz to 400 kHz by re-sampling with 125/3) Super frame length = about 9 seconds (CFO removal at start of each) Channel estimation = around every 100 msec (training seq. space) Daughter board = LFTX / LFRX The question is this: What criteria should I consider when designing the FIR filters in the re-sampling chain to be sure I do not add any distortion to the link??? Regards, Al

The filters will need to pass the bandwidth you need, and attenuate the images. The filters will be pretty large for a ratio of 125/3, but that shouldn't be a problem at these low data rates. Matt On Mon, Feb 24, 2014 at 10:07 AM, Ali G. Dezfuli <ali69550@gmail.com> wrote: > Hi, > I have a problem in communicating a waveform with the following specs: > > Waveform Baud rate = 2400 > Waveform Sample rate = 9600 Hz > USRP input sample rate = 400 kHz (9600 Hz to 400 kHz by re-sampling with > 125/3) > Super frame length = about 9 seconds (CFO removal at start of each) > Channel estimation = around every 100 msec (training seq. space) > Daughter board = LFTX / LFRX > > The question is this: > What criteria should I consider when designing the FIR filters in the > re-sampling chain to be sure I do not add any distortion to the link??? > > Regards, > Al > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >